From dc0217d20e3c96203c81acda1c02652755bfcefb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Draszik?= <andre.draszik at jci.com <https://lists.yoctoproject.org/listinfo/yocto>>
Date: Fri, 2 Mar 2018 10:24:11 +0000
Subject: [PATCH 7/9] hotspot: os_linux_x86: remove glibc dependencies
 (fpu_control.h)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

musl doesn't provide fpu_control.h, open-code the relevant
bits instead.

Patch adopted from Alpine linux:
    https://git.alpinelinux.org/cgit/aports/tree/community/openjdk8/icedtea-hotspot-musl.patch?id=4d34f29dddd3934358df7a9607706d09ae0433c3

Upstream-Status: Inappropriate [musl specific]
Signed-off-by: André Draszik <andre.draszik at jci.com <https://lists.yoctoproject.org/listinfo/yocto>>
---
 hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp b/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp
index fb96738a..982ce84d 100644
--- a/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp
+++ b/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp
@@ -72,7 +72,6 @@
 # include <pwd.h>
 # include <poll.h>
 # include <ucontext.h>
-# include <fpu_control.h>
 
 #ifdef AMD64
 #define REG_SP REG_RSP
@@ -543,6 +542,9 @@ JVM_handle_linux_signal(int sig,
   return true; // Mute compiler
 }
 
+#define _FPU_GETCW(cw) __asm__ __volatile__ ("fnstcw %0" : "=m" (*&cw))
+#define _FPU_SETCW(cw) __asm__ __volatile__ ("fldcw %0" : : "m" (*&cw))
+
 void os::Linux::init_thread_fpu_state(void) {
 #ifndef AMD64
   // set fpu to 53 bit precision
-- 
2.16.2